Try to induce a two photon quantum interference in a single molecule to have the optical control in the emission of the photons. How strong can the effect be is a open question.
Can you be a bit more specific? What kind of control are you looking for?
is a similar experiment as Electroinduced transparency (EIT)... In which an emmisive electronic transition acts like the probe ...and a second electronic transition act as the pump ... Then when the two transitions are at its own resonance, a quantum interference between the two photons is produced and the emission of the photons is stopped ... How strong can be the effect, is how much pump photons are needed to switch of how many emmited photons?
Commonly large number of photons are needed, so that pump transition must be close to saturation. However, if we put three-level system into a photonic crystal, the pump flux falling onto it can be much smaller. I remember a paper by Arkhipkin in PRA, if I will find it, I will give a reference
This is a paper describing that effect in a four-level scheme - http://pra.aps.org/abstract/PRA/v86/i6/e063816
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